SEMOVE/GANDR is a Fortran-77 computer program for computing the derivatives of processed multigroup nuclear data with respect to the individual parameters of the GANDR library.

The basic premise is that a user has chosen a multigroup processing program such as NJOY and has developed a script that allows the calculation of all nuclear data of interest in his selected group structure and with his selected weight function. The file njg included in this distribution is an example of such a user-supplied script.

A distinctive feature of the GANDR project is that the fundamental data uncertainties are assumed to reside, not in the ENDF evaluations, but in the parameters of the GANDR library. To interface the GANDR library with normal sensitivity tools (such as SUSD3D), and thereby to permit the GANDR library to be improved by exploiting the information content of accurate integral data, we need to be able to calculate the changes in the multigroup cross sections that result from changes in the GANDR parameters.